Cucumber flower topping, also known as "flower head" or "top flower", is a common physiological disorder on cucumbers in greenhouses. Its main symptoms are: the internodes near the growth point are shortened; The flower clusters of the flowers are in the form of "flower heads"; "flower topping" occurs at the beginning of the results, and has a great influence on the yield and quality.
According to many years of experimental observation, cucumber flower topping can usually be divided into three types: (1) Developmental dysregulation. The early temperature is low, and there is a large temperature difference between day and night. Plants are inhibited by vegetative growth and reproductive growth is too fast. It is easy to appear "flower topping." (2) Injury root type. High temperature and drought in the greenhouse, especially when the soil is dry, may be caused by too much fertilizer and insufficient water to cause root burning, or if the soil is too wet, but the temperature and the ground temperature are low, resulting in the roots of the roots. (3) Physiological deficiency type. Unfavorable soil conditions, weak root activity, and difficulty in attracting fertilizers can lead to "flower topping" when the physiological deficiency occurs.
Prevention methods: (1) Reasonably regulate the temperature, prevent it from being too low or too high; timely loosen the soil and raise the ground temperature; if necessary, fertilize and water first, then warm up the soil to promote root development. (2) The rational use of fertilizer and water. Greenhouse cucumber fertilization, to master a small amount, multiple times, Shi Liu, the application of organic fertilizer must be fully decomposed, to prevent improper rooting due to improper fertilization; timely watering amount, avoid flooding and affecting the ground temperature, resulting in roots. (3) Remedy. Plants with flowering toppings have appeared, female flowers have been removed in appropriate amounts and sprayed with potassium dihydrogen phosphate 300 times; when watering of rooted flowers occurs, watering is done in time so that the water holding capacity of the soil reaches 22%, and the relative humidity of the air reaches 65%, irrigated with water, soon return to normal.
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